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Recovering Pointwise Values Of Discontinuous Data Within Spectral Accuracy by David Gottlieb
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1NASA Technical Reports Server (NTRS) 19850013739: Recovering Pointwise Values Of Discontinuous Data Within Spectral Accuracy
By NASA Technical Reports Server (NTRS)
The pointwise values of a function, f(x), can be accurately recovered either from its spectral or pseudospectral approximations, so that the accuracy solely depends on the local smoothness of f in the neighborhood of the point x. Most notably, given the equidistant function grid values, its intermediate point values are recovered within spectral accuracy, despite the possible presence of discontinuities scattered in the domain. (Recall that the usual spectral convergence rate decelerates otherwise to first order, throughout). To this end, a highly oscillatory smoothing kernel is employed in contrast to the more standard positive unit-mass mollifiers. In particular, post-processing of a stable Fourier method applied to hyperbolic equations with discontinuous data, recovers the exact solution modulo a spectrally small error. Numerical examples are presented.
“NASA Technical Reports Server (NTRS) 19850013739: Recovering Pointwise Values Of Discontinuous Data Within Spectral Accuracy” Metadata:
- Title: ➤ NASA Technical Reports Server (NTRS) 19850013739: Recovering Pointwise Values Of Discontinuous Data Within Spectral Accuracy
- Author: ➤ NASA Technical Reports Server (NTRS)
- Language: English
“NASA Technical Reports Server (NTRS) 19850013739: Recovering Pointwise Values Of Discontinuous Data Within Spectral Accuracy” Subjects and Themes:
- Subjects: ➤ NASA Technical Reports Server (NTRS) - APPROXIMATION - DISCONTINUITY - SHOCK WAVES - SMOOTHING - SPECTRAL METHODS - COMPUTATIONAL GRIDS - DIRICHLET PROBLEM - FOURIER ANALYSIS - KERNEL FUNCTIONS - TRUNCATION ERRORS - Gottlieb, D. - Tadmor, E.
Edition Identifiers:
- Internet Archive ID: NASA_NTRS_Archive_19850013739
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